Pregnancy or period pains??

My period is due on Tuesday😢 ive been so bloated my breast are so so so sore ive felt sick for the past week ive had massive head aches which isnt like me ive been so tired too and have no energy and a really bad stabbing pains on my right hand side just under my stomach. Ive been so stressed out and a little emotional. Also ive been really thirsty like really thirsty!! Last week i also had a lot of discharge? Advise please.